Mill for grinding grains and nuts.



P. OEHMIG.

MILL FOR GRINDING GRAINS AND NUTS.

APPLICATION IILBD FEB. 1, 1913.

1 ,095,5 1 6, Patented May 5, 1914.

,jnventfw DLUMBIA FLANDGRAPH col, WASHINGTON. D. c.

= gTES Ffdllt PAUL OEHMIG, OF CHICAGO, ILLINOIS.

To all whom it may concern Be it known that 1, PAUL OEHMIG, citizen of the United States, and resident of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Mills for Grinding Grains and Nuts, of which the following is a full, clear, and exact specification.

This invention relates to improvements in mills for grinding grains and nuts, containing either moist glutinous matter, or oil, but more particularly nuts, such for example as peanuts wherein the percentage of oil is so great that for reducing them to peanut butter sausage grinders have heretofore been exclusively employed to the exclusion of opposing mill stones, for the reason that centrifugal force, which has heretofore been necessarily exclusively relied on for dis chargin therefrom the oily mass or butter is whol f insufficient for that purpose, although it has long been well known that if mill stones could be used, a substantially better and superior article of butter would be produced.

The prime object of my invention is a grindingstone-mill, in which the ground product independently of centrifugal force is provided with a force operating independently from the centrifugal force, and alone sufficient to discharge the ground product from between the stones.

A further object of my invention is to promote the feed of grains and nuts to mill stones, and also the uniformity of their feed by a continuous force applied thereto while being fed to the stones, and at the same time a uniform movement of grains and nuts across the opposing faces of the stones and their discharge therefrom at their periphcry, and without having to rely at all upon centrifugal force therefor.

With these ends in view, my invention finds embodiment in certain features of novelty in the construction, combination and arrangement of parts by which the said objects and certain other objects are hereinafter attained, all as fully described with reference to the accompanying drawing, and more particularly pointed out in the claims.

In said drawing is illustrated in section a mill for grinding grains, nuts, etc. in which my invention finds embodiment.

Similar characters of reference indicate the same parts in said drawing.

1 indicates a lower and revolving mill Specification of Letters ZE atent.

Application filed February 1, 1913.

Patented May 5, 1914.

Serial No. 745,540.

stone, and 2 the upper and fixed mill stone, such as are commonly used in grinding mills, and which may be of any of the forms ordinarily employed, although shown in the drawing as annular in form, as a'means providing for keeping them cool, as hereinafter described.

3 indicates a casing cup in which the lower stone 1 is supported, and 4c the annular ring for securing the stone therein and provided with a flange 5, upon which is discharged the ground materials from the stones, below which stone is a water chamber 6 from which the water is discharged through a, pipe 7 into a receptacle 8 sleeved on the power shaft 9 by means of which the lower stone is revolved and to which end the lower stone is centered on the upper endof the shaft 9, and secured by a cone 10 in the hub 11 of the cup-like casing 3.

The upper and fixed stone 2 is secured to and suspended from a cap-like casing 12 between which and the stone is an annular water chamber 13 to which water is supplied through a pipe 14: from any suitable source and is discharged from the chamber 13 through the pipe 15 into the funnel 16 of a pipe 17 whence it passes into a chamber 18 in the casing of the lower stone, and thence through a pipe 19 into the water chamber 6.

At this point it should however be stated that the parts so far referred to form no part of my present invention, and are referred to only for the purpose of illustrating the application of my invention presently to be described, in its application to an operative stone grinding mill, and in one in which ample provision is made for maintaining the stone in a cooled condition by circulating water.

The mill stones 1 and 2 are shown in annular form although it will presently be apparent that my invention is equally well adapted to center feed stones of mills in which the grinding surface of the one stone is imperforate, and the other is provided with a perforation through which the materials to be ground are conoucted between the stones and discharged therefrom alone by a centrifugal force if and when discharged at all in their ground condition.

As indicated in the drawing the feed opening for stones of annular form is usual adjacent the inner vertical wall of the fixed stone as indicated at 20, and to which the grain is conducted by means of a funnel 21, the neck 22 of which, as usual, projects down into the feed opening 20, and through which heretofore the materials to be ground are fed. by gravity alone between the stones, and as ground are discharged therefrom solely by centrifugal force, neither of which forces as before stated. are sufficient to make it possible or practical for the grinding of grains or nuts from which there results a viscous mass due to the presence of a sub stantial percentage of moist gluten therein, and particularly when containing in any such large percentage of oil as is naturally contained in peanuts. R

My invention, therefore contemplates the employment of some, or any means producing independently of gravity and centrifugal force, a force feed to the grains or nuts across and outwardly of the peripheries of the stones, and to this end I find in practice a simple and effective means to be a screw conveyer 28, adapted to fit quite closely but turn freely in the neck 22 of the funnel 21, and which at the same time furnishes a hearing for the wings thereof, and thereby prevents the screw conveyer from cutting away the adjacent walls of the stones between which it projects.

is a means for operating the screw conveyor 23, the upper end thereof by me: is of its stem Q-l is secured to and suspended from a vertical shaft by a screw 20, which shaft 25 is in turn suspended in and from a suitable bearing 2-7, and provided with a pinion 28 rigidly secured to the shaft. Pinion 28 meshes with a gear :29 on a shaft 30, the upper end of which. projects into a bearing 31, which shaft pa. es through the funnel structure 16, and ln its lower end rigidly secured to the hub 11 of the casing for the revolving stone by means of an angular socket 32 fitting upon a corresponding projection 33 on the cone 10. By so constructing and locating the shaft 30 it is not only revolved with the lower stone. but is convenient of assemblage therewith.

From the foregoing it will now be seen that when the mill is in operation the shaft 30 and its gear .29 will be revolved at the same speed at which the lower stone is revolved, and that meshing with the pinion 1-8 on the shaft the screw conveyer will likewise be revolved by it at a higher speed forcing grain or nuts as may be, in the fun no] or hopper, continuously, and with uni.- form speed down to and between the mill stones 1 and 2, and uniformly between and across the opposing faces of the stones and out the discharge opening therefrom at their periphery. In practice however, l have found that to obtain the best results in ducing peanuts to butter the conveyor should make about 200 revolutions per minute while the stones are making revolutions per minute, but, of course, my invention is not limited to those relative speeds, nor to the relative diameters of the gear and the pinion meshing therewith.

With the understanding and belief that my invention is the first to provide any means by which grains or nuts are delivered between and discharged from mill grinding stones with a force substantially inexcess of that produced by their gravity and the centrifugal force produced in the operation of mill stones, it is obvious that my invention is not limited to a screw conveyor specifically for that purpose, but includes any means by which the new and useful result attributable thereto may be produced. 'ln short. my invention includes any means by which independently of gravity and cen trifugal force grain or nuts may be forced between and discharged from opposing niill grinding stones, when they contain constituents which would otherwise prohibit the use of such stones for reducing them or either of them to their desired or necessary comminution, and particularly when otherwise such grain or nuts contain a sulficient amount of moist gluten, gums or oil prohibitoifiv of their being reduced between opposing mill. stones, to the degree necessary for their commercial use.

Having described my invention, what i claim and desire to secure by Letters Patent is:

1. A grinding mill comprising in combination a revolving stone, a drive shaft therefor, an opposing fixed stone, a conveyer projected through one of said stones, the axis of which is parallel to the axis of said stone.

2. A grinding mill comprising in combination a revolving stone, a drive shaft therefor, an opposing fixed stone, a passage through said stones surrounding the axis thereof, and a conveyer projected through one of said stones at a point removed from said axial passage.

3. A grinding mill comprising in combinations revolving stone, a drive shaft therefor, a fixed stone, a conveyor projected therethrough along a line parallel. to the axis of said stones, means suspending said conveyor from contact with the lower stone, and a gear connection between said conveyor and drive shaft.

in witness whereof, I have hereunto set mv hand and affixed my seal, this 13th day of January A. D. 1913.

PAUL OEHMIG.

in. sxl

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

